OLED display panel and manufacture method thereof

Abstract

The present invention discloses an OLED display panel, comprising a substrate; a semitransparent cathode, formed on the substrate; an emission layer, formed at one side of the semitransparent cathode away from the substrate; a transparent anode, formed at one side of the emission layer away from the semitransparent cathode; and a photochromic layer, being formed at one side of the transparent anode away from the emission layer, and the photochromic layer comprises photochromic material which changes from transparent to opaque under excitation of light, and the light emitted by the emission layer comprises a wavelength employed to excite the photochromic material. The OLED display panel of the present invention has the longer micro cavity total optical distance. The present invention further discloses a manufacture method of an OLED display panel.

What is claimed is: 
     
       1. An OLED display panel, comprising:
 a substrate; 
 a semitransparent cathode, formed on the substrate; 
 an emission layer, formed at one side of the semitransparent cathode away from the substrate; 
 a transparent anode, formed at one side of the emission layer away from the semitransparent cathode; and 
 a photochromic layer, being formed at one side of the transparent anode away from the emission layer, and the photochromic layer comprises photochromic material which changes from transparent to opaque under excitation of light, and the light emitted by the emission layer comprises a wavelength employed to excite the photochromic material, wherein the photochromic layer forms a resonant micro cavity with the semitransparent cathode for the light emitted by the emission layer to increase a total optical distance of the resonant micro cavity to provide a higher light efficiency of the OLED display panel. 
 
     
     
       2. The OLED display panel according to  claim 1 , wherein the transparent anode employs tin indium oxide material. 
     
     
       3. The OLED display panel according to  claim 1 , wherein the semitransparent cathode employs magnesium-silver alloy. 
     
     
       4. The OLED display panel according to  claim 1 , wherein as the emission layer does not emit the light, a transmissivity of the photochromic layer in the visible light range is larger than 90%; as the emission layer emits the light, the transmissivity of the photochromic layer in the visible light range is smaller than 10%. 
     
     
       5. The OLED display panel according to  claim 4 , wherein the photochromic material comprises one or more of silver halide, zinc halide, copper halide, magnesium halide, spiro pyran, phenoxazine, oxazine dye and pyridine. 
     
     
       6. The OLED display panel according to  claim 1 , wherein the OLED display panel further comprises an adjustment layer formed between the photochromic layer and the transparent anode, and the adjustment layer employs transparent material, and is employed to adjust a gap between the photochromic layer and the transparent anode. 
     
     
       7. The OLED display panel according to  claim 1 , wherein the OLED display panel further comprises:
 a Hole Injection Layer, formed at the one side of the transparent anode away from the photochromic layer; 
 a Hole Transporting Layer, formed between the Hole Injection Layer and the emission layer; 
 an Electron Transport Layer, formed at one side of the emission layer away from the Hole Transporting Layer; and 
 an Electron Injection Layer formed between the Electron Transport Layer and the semitransparent cathode. 
 
     
     
       8. A manufacture method of an OLED display panel, comprising steps of:
 sequentially forming a semitransparent cathode, an emission layer and a transparent anode on a substrate; 
 forming a photochromic layer at one side of the transparent anode away from the emission layer, and the photochromic layer comprises photochromic material which changes from transparent to opaque under excitation of light, and the light emitted by the emission layer comprises a wavelength employed to excite the photochromic material, wherein the photochromic layer forms a resonant micro cavity with the semitransparent cathode for the light emitted by the emission layer to increase a total optical distance of the resonant micro cavity to provide a higher light efficiency of the OLED display panel. 
 
     
     
       9. The manufacture method of the OLED display panel according to  claim 8 , wherein the step of sequentially forming a semitransparent cathode, an emission layer and a transparent anode on the substrate comprises:
 depositing magnesium-silver alloy at one side of the emission layer away from the transparent anode to form the semitransparent cathode; 
 depositing emission material at one side of the semitransparent cathode away from the substrate with evaporation to form the emission layer; and 
 depositing tin indium oxide material at one side of the emission layer away from the semitransparent cathode to form the transparent anode. 
 
     
     
       10. The manufacture method of the OLED display panel according to  claim 9 , wherein the step of forming a photochromic layer at one side of the transparent anode away from the emission layer comprises:
 depositing the photochromic material at one side of the transparent anode away from the emission layer with evaporation, sputtering or electron beam to form the photochromic layer.